JP6563829B2 - Hollow cylinder structure manufacturing method, hollow cylinder structure and hollow cylinder structure - Google Patents

Description

  The present invention relates to a method of manufacturing a hollow cylinder structure in which wiring / piping materials are arranged inside a hollow cylinder, a hollow cylinder for arranging wiring / piping materials inside, and wiring / piping materials. The present invention relates to a hollow cylinder structure disposed inside a hollow cylinder.

  Generally, for the purpose of protecting wiring / piping materials, a hollow cylindrical body (for example, a protective tube) is used to accommodate the wiring / piping material inside. Conventionally, in order to make it easier to accommodate wiring / piping materials inside the hollow cylinder, a slit part continuously extending along the axial (long) direction of the cylindrical wall of the hollow cylinder is formed, and the slit part is opened. Thus, the wiring / pipe material is inserted into the hollow cylindrical body from the split portion. And various means are employ | adopted in order to join a slit part after accommodating wiring and piping material.

  For example, Patent Document 1 discloses a method for laying a cable protection tube. The cable protection pipe (1) includes a pipe body (2) having a split part (2a) formed in the peripheral wall part, and a coupling member (3) engaged with the pipe body (2) at the split part (2a). It is made up of. At least one cable (4) such as a power cable, a communication cable, and an optical cable is accommodated in the protective tube (1). And the peripheral wall part (200) of a pipe | tube main body (2) can be isolate | separated and opened in the split part (2a). When the cable (4) is accommodated in the protective tube (1), the tube body (2) is first expanded at the split portion (2a), and the cable (4) is placed inside the tube body (2). insert. Next, the coupling member (3) in which the heating wires (310, 311, 312) are embedded is fitted to the pipe body (2) at the split portion (2a), and the outer side plate portion (301) of the coupling member (3) is fitted. ) And the inner rib plate portion (302), the circumferential end portions (200a, 200b) of the peripheral wall portion of the pipe body (2) facing each other are sandwiched through the split portion (2a). And it supplies with electricity to a heating wire (310,311,312) in the state which fitted the coupling member (3) to the pipe | tube main body (2). When the heating wires (310, 311 and 312) are energized, both surfaces of the main plate portion (300) of the coupling member (3) are brought into contact with the inner surface of the split portion (2a) of the pipe body (2) by heat generated from the heating wires (310). The circumferential end portions (200a, 200b) of the peripheral wall portion of the pipe main body are mechanically joined via the main plate portion (300). In addition, the code | symbol of patent document 1 was shown in ().

  Patent document 2 discloses the manufacturing method of the wire harness which protects an electric wire bundle using the protective material which has a parting part. The wire harness includes an electric wire bundle (20) including a plurality of electric wires (21) and a cylindrical corrugated tube (30) that covers and protects the electric wire bundle (20). The corrugated tube (30) has a slit (33) formed so as to extend from one end to the other end along the axial direction so as to divide the tube (30) in the circumferential direction. The wire bundle (20) can be inserted into the tube (30) through the slit (33) from a direction perpendicular to the axial direction of the corrugated tube (30). Then, the slit (33) of the corrugated tube (30) after the wire bundle (20) is inserted is sealed by the thermoplastic resin discharge facility (40). Specifically, the thermoplastic resin (44) melted in the heating section (41) of the thermoplastic resin discharge facility (40) and discharged from the nozzle (42) is transferred from one end of the slit (33) to the other end. The whole area is filled up to. The thermoplastic resin (44) thus filled is then cooled and solidified, whereby the slit (33) is sealed and a wire harness is manufactured. In addition, the code | symbol of patent document 2 was shown in ().

  Patent Document 3 discloses a corrugated tube wire harness exterior method. The corrugated tube (1) is provided with annular crests (3) and troughs (4) alternately in the length direction (L), and one slit (2) in the total length in the length direction. Provided. The dividing portions (5, 6) sandwiching the slit (2) protrude in the circumferential direction continuously from the bottom wall portion (4a) of the valley portion (4) along the length direction (L) and in the length direction. (L) is provided with belt portions (7, 8) extending to the ends of the belt portions (7, 8), that is, flat plate-like welded plate portions projecting outward at the divided ends (5a, 6a). (9, 10) is projected. To close the slit (2), the welding plate portions (9, 10) are overlapped and sandwiched between the side plate portions (30a) and (30b) of the electric iron (30), and in this state the welding plate portions (9, 10) is heated. By heating the weld plate portions (9, 10) with the electric iron (30), the joint surfaces of the weld plate portions (9, 10) are welded. In addition to a heater composed of an electric iron (30), a welding machine composed of an ultrasonic generator is preferably used. In addition, the code | symbol of patent document 3 was shown in ().

JP 2008-295146 A Japanese Patent Laying-Open No. 2015-84627 JP 2010-200549 A

  The above-described conventional method for manufacturing a hollow cylinder having wiring and piping materials disposed therein has the following problems. For example, the method of Patent Document 1 is characterized in that the split portion is closed by interposing the connecting member in which the heating wire is embedded between the inner surfaces of the split portion of the protective tube and thermally melting it. However, in the method of Patent Document 1, it is necessary to separately prepare or manufacture a connecting member with heating wire, and then attach the connecting member to the protective tube, so that the workability and manufacturing cost are not good. . Furthermore, since the molten coupling member is interposed between the inner surfaces of the split portion, the diameter of the protective tube becomes larger than before cutting, and the melting mark of the coupling member remains relatively large, so that the appearance is not good. Was a problem. In addition, since a material separate from the protective tube connects the inner surface of the split portion of the protective tube, there is a problem that it is difficult to maintain the bonding strength. Furthermore, the solidified coupling member becomes a spine (protrusion) extending in the axial direction, and the problem is that the ease of bending of the protective tube, which is a corrugated tube, decreases.

  Moreover, in the method of patent document 2, a slit is obstruct | occluded by filling with the thermoplastic resin thermally melted over the whole region from the one end of a slit of a corrugated tube to the other end. That is, in Patent Document 2, similarly, since it is required to separately prepare a molten thermoplastic resin, it is not good in terms of workability and manufacturing cost. Furthermore, since the thermoplastic resin is interposed between the end faces through the slits, the corrugated tube has a larger diameter than before cutting, and the solidified thermoplastic resin rises and the melt marks remain relatively clear, so that it looks good. Is not good. In addition, since a material separate from the corrugated tube connects the inner surface of the split portion of the protective tube, there is a problem that it is difficult to maintain the bonding strength. Furthermore, when the thermoplastic resin is filled, the problem is that the thermoplastic resin accumulates in the troughs of the tube and the ease of bending of the corrugated tube decreases.

  Further, in Patent Document 3, a flat plate-shaped welded plate portion that protrudes outward is formed at the split end of the slit, and the overlapped portion is sandwiched by a heater or an ultrasonic generator in a state where the welded plate portions are overlapped. By heating, the welding plate portion is welded to seal the slit. In patent document 3, a part of corrugated tube is welded mutually, without preparing the material for welding separately. However, in the method of welding with a heater or an ultrasonic generator as in Patent Document 3, the object cannot be locally heated, so that heat is applied over a relatively wide range of the corrugated tube or corrugated. Ultrasonic vibration is applied throughout the tube. Therefore, the welding allowance such as the welded plate portion must be formed wide so that the peripheral wall of the corrugated tube is not affected by heat or the like. And since the whole welding allowance heated and cooled melts and solidifies, a burr | flash etc. generate | occur | produces over the comparatively wide range of a corrugated tube, and appearance looks very bad. Furthermore, since the superposition | polymerization and welding part of a welding board part have low flexibility compared with the other location formed from the mountain and valley, it is mentioned as a problem that the bendability of a corrugated tube falls by welding of a slit.

  That is, in the conventional method of joining the slitting portions (the splitting portion of Patent Document 1, the slits of Patent Literatures 2 and 3), it is difficult to block the appearance of the cutting portion with good appearance. Furthermore, in the conventional method, a protrusion made of a molten resin is formed at a bonded or welded portion, or a thermoplastic resin enters a trough portion of a corrugated tube, so that one spine having low flexibility is pivoted. The problem is that the flexibility of the flexible wiring / pipe material (corrugated tube) formed in the direction is hindered. The present invention solves the above-mentioned problems by introducing a novel method for closing a slit portion that has not been conventionally used. That is, the object of the present invention is to provide wiring and piping materials inside the hollow cylinder so as to improve the appearance of the closed cut portion, the bendability of the hollow cylinder, and the joint strength of the cut portion. Provided is a method for manufacturing a hollow cylinder structure, a hollow cylinder for arranging wiring / piping materials therein, and a hollow cylinder structure in which wiring / piping materials are arranged inside the hollow cylinder. It is in.

The method for producing a hollow cylinder structure according to claim 1 is a method for producing a hollow cylinder structure in which wiring and piping materials are disposed inside a hollow cylinder,
A step of preparing a hollow cylinder, wherein the hollow cylinder is located on the inner side of the laser beam transmission layer, a heat-meltable laser beam transmission layer constituting an outer layer of the hollow cylinder, and the laser A laminated portion integrally laminated with a heat-meltable laser light absorption layer having a relatively lower transmittance than the light-transmitting layer, and the laminated portion is at least a part in the circumferential direction of the hollow cylindrical body The laminated portion is formed with an openable slit portion that divides the laminated portion in the width direction and continuously extends in the axial direction of the hollow cylindrical body. , Process and
A step of accommodating the wiring / piping material from the slit portion;
After closely contacting the split end faces through the split section, the split section is irradiated with laser light from the outer surface of the hollow cylindrical body, and the split end faces are laser welded to form the split section. A blockage step;
It is characterized by including.

The method for manufacturing a hollow cylinder structure according to claim 2 is the method for manufacturing a hollow cylinder structure according to claim 1, wherein the hollow cylinder structure includes a wiring / pipe material disposed inside the hollow cylinder. A method,
A heat-meltable laser light transmission layer constituting the outer layer of the hollow cylinder, and a heat-meltable laser light transmission layer located on the inner layer side of the laser light transmission layer and having a relatively lower transmittance than the laser light transmission layer A step of preparing the hollow cylindrical body in which a laminating portion in which a laser light absorption layer is integrally laminated is continuously formed in an axial direction in at least a part of the circumferential direction of the hollow cylindrical body;
Forming a slit part that can be opened in the hollow cylinder by continuously cutting the hollow cylinder along the axial direction so as to divide the laminated part in the width direction;
A step of accommodating the wiring / piping material from the slit portion;
After contacting the cut end faces facing each other via the cut portion, the cut portion is irradiated with laser light from the outer surface of the hollow cylinder, and the cut end surface is laser welded to close the cut portion. And a process of
It is characterized by including.

  The method for producing a hollow cylinder structure according to claim 3 is the method for producing a hollow cylinder structure according to claim 1 or 2, wherein the step of preparing the hollow cylinder comprises a step of forming the hollow cylinder. It is characterized by including.

  The method for producing a hollow cylinder structure according to claim 4 is the method for producing a hollow cylinder structure according to any one of claims 1 to 3, wherein the step of closing the cut portion is performed when the laser beam is irradiated. It includes a step of pressurizing the split end faces in the close contact direction.

  The method for manufacturing a hollow cylinder structure according to claim 5 is the method for manufacturing a hollow cylinder structure according to any one of claims 1 to 4, wherein each of the divided end surfaces is orthogonal to a cylinder wall of the hollow cylinder structure. It is characterized by being a flat surface.

The method for producing a hollow cylinder structure according to claim 6 is the method for producing a hollow cylinder structure according to any one of claims 1 to 5, wherein the hollow cylinder has peaks and valleys in the axial direction. A continuous corrugated tube,
The step of closing the cut portion includes a step of bringing the divided end faces into close contact with each other in a state where the peaks and valleys of the corrugated tube are shifted in the axial direction when the laser beam is irradiated.

The method for producing a hollow cylinder structure according to claim 7 is the method for producing a hollow cylinder structure according to any one of claims 1 to 6, wherein the hollow cylinder has peaks and valleys in the axial direction. A continuous corrugated tube,
In the step of closing the slit portion, the irradiation angle of the laser beam is smaller than the inclination angle of the peaks and valleys in the axial direction of the corrugated tube.

The method for producing a hollow cylinder structure according to claim 8 is the method for producing a hollow cylinder structure according to any one of claims 1 to 7, wherein the laser light transmission layer is made of a polyolefin-based thermoplastic resin. ,
The laser light absorbing layer is composed of a base material made of a polyolefin-based thermoplastic resin and carbon black that is added to the base material and absorbs laser light to generate heat.

The hollow cylinder according to claim 9 is a hollow cylinder for disposing wiring / piping material therein,
A heat-meltable laser light transmission layer constituting the outer layer of the hollow cylinder, and a heat-meltable laser light transmission layer located on the inner layer side of the laser light transmission layer and having a relatively lower transmittance than the laser light transmission layer Provided with a laminated part in which the laser light absorption layer is laminated integrally,
The laminated portion is characterized by being formed continuously in the axial direction at a part of the circumferential direction of the hollow cylindrical body.

The hollow cylinder according to claim 10 is a hollow cylinder for disposing wiring / piping material therein,
A heat-meltable laser light transmission layer constituting the outer layer of the hollow cylinder, and a heat-meltable laser light transmission layer located on the inner layer side of the laser light transmission layer and having a relatively lower transmittance than the laser light transmission layer Provided with a laminated part in which the laser light absorption layer is laminated integrally,
The laminated portion is formed continuously in the axial direction at a part of the circumferential direction of the hollow cylindrical body, and the laminated portion is divided in the width direction so as to be axial in the hollow cylindrical body. A slit portion extending continuously is formed.

  The hollow cylindrical body according to claim 11 is the hollow cylindrical body according to claim 10, wherein the divided end faces opposed to each other through the slit portion are planes orthogonal to the cylindrical wall of the hollow cylindrical body. And

  The hollow cylinder according to claim 12 is the hollow cylinder according to any of claims 9 to 11, wherein the hollow cylinder is a corrugated tube in which peaks and valleys are continuous in the axial direction. It is characterized by.

  The hollow cylinder according to claim 13 is the hollow cylinder according to claim 12, wherein the thickness of the laser light absorption layer at the peak portion of the corrugated tube is greater than the thickness of the laser light absorption layer at the valley portion. Is also thin.

  The hollow cylindrical body according to claim 14 is the hollow cylindrical body according to claim 12 or 13, wherein the height of the peak and the valley is higher in the stacked portion than in a portion other than the stacked portion. It is small.

  The hollow cylinder according to claim 15 is the hollow cylinder according to any one of claims 9 to 14, wherein the base material of the hollow cylinder is polyethylene.

The hollow cylinder structure according to claim 16 is a hollow cylinder structure comprising a wiring / piping material and a hollow cylinder having the wiring / piping material disposed therein,
The hollow cylinder is located on the inner side of the laser beam transmitting layer and a heat-meltable laser beam transmitting layer constituting the outer layer of the hollow cylinder, and has a relatively lower transmittance than the laser beam transmitting layer. And a laminated part integrally laminated with a heat-meltable laser light absorption layer having
The laminated portion is formed continuously in the axial direction at a part of the circumferential direction of the hollow cylindrical body, and the laminated portion is divided in the width direction so as to be axial in the hollow cylindrical body. A joint portion extending continuously is formed, and a fusion mark of the joint portion is formed on a cross section of the laminated portion without appearing on the outer surface of the hollow cylindrical body.

The hollow cylinder structure according to claim 17 is a method of manufacturing a hollow cylinder structure in which wiring and piping materials are disposed inside the hollow cylinder,
A step of preparing a hollow cylinder, wherein the hollow cylinder is adjacent to the heat-meltable laser light transmission layer and the laser light transmission layer, and has a relatively lower transmittance than the laser light transmission layer. A laminated portion integrally laminated with a heat-meltable laser light absorption layer having, the laminated portion is formed continuously in the axial direction in at least a part of the circumferential direction of the hollow cylinder, The laminated portion is formed with an openable slit portion that divides the laminated portion in the width direction and continuously extends in the axial direction of the hollow cylinder, and
A step of accommodating the wiring / piping material from the slit portion;
After closely attaching the cut end faces facing each other through the cut portion, the laser light is irradiated from the laser light transmitting layer side to the cut portion, and the cut end portions are laser welded to form the cut portion. A blockage step;
It is characterized by including.

According to the method for manufacturing a hollow cylinder structure according to claim 1 of the present invention, the hollow cylinder is positioned on the inner side of the laser light transmission layer and the heat-meltable laser light transmission layer constituting the outer layer. And a laminated portion in which a heat-meltable laser light absorption layer having a relatively higher absorbance than the laser light transmission layer is integrally laminated. The wiring / pipe material can be inserted into the hollow cylindrical body through the cutting portion formed so as to cut the laminated portion. Then, with the wiring / piping material inserted into the hollow cylinder, the divided end faces that divide the laminated part in the width (circumferential) direction are brought into close contact with each other, and then the laser is applied to the split part from the outer surface of the hollow cylinder. By irradiating with light, the split end faces can be laser-welded to block off the cut portion with good appearance. Thereby, in the hollow cylinder structure manufactured with the manufacturing method of this invention, it can suppress as much as possible that generation | occurrence | production of a burr | flash and the appearance of a hollow cylinder structure worsen. Furthermore, in the manufacturing method of the present invention, the split end faces are directly joined without any other material, so that the cut portion can be closed as if there was no cut portion on the cylindrical wall of the hollow cylindrical body from the beginning. . That is, the manufacturing method of the present invention can prevent the bending property (flexibility) of the hollow cylinder from being impaired by the blockage of the cut portion.
And since the manufacturing method of this invention welds a part (same material) of hollow cylinders, without preparing another material like a coupling member separately, ensuring the high joint strength of a split part, and It is also advantageous in terms of workability and cost.

  More specifically, when a laser beam having a predetermined intensity is locally applied to the contact portion of the divided end face, a significant amount of laser light passes through the outer laser beam transmitting layer and is absorbed by the inner laser beam. Absorbed into the layer. At this time, the laser light absorbing layer functions to prevent the laser light from passing through the cylindrical wall and melting and damaging the outer surface of the wiring / pipe material disposed inside. Then, the laser light absorption layer is preferentially heated at the slit portion where the cut end face is in close contact. Subsequently, from the heated portion of the laser light absorption layer (interface between the laser light transmission layer and the laser light absorption layer), heat is transferred in the thickness direction along the interface between the split end faces (that is, the outer surface side of the laser light transmission layer and Conducted to both the inner surface side of the laser light absorption layer), and the entire cut end surface is heated and melted. In particular, the laminated part is composed of two layers, a laser light transmission layer and a laser light absorption layer, and the laser light transmission layer covers the laser light absorption layer, so that the melting direction of the laser light absorption layer is determined on the divided end face side. Can be welded efficiently. And as a result of this heat-melting parting end surfaces forming a fusion pool and mixing with material and cooling, the parting end faces are joined (fused) uniformly. That is, in the laser welding process of the cut portion, the split end face is preferentially melted and solidified, so that almost no trace of melting appears on the outer surface of the hollow cylinder. Furthermore, in the present invention,

  According to the method for manufacturing a hollow cylindrical structure according to claim 2 of the present invention, the hollow cylindrical body is located on the inner side of the laser light transmitting layer and the heat-meltable laser light transmitting layer constituting the outer layer thereof. And a laminated portion in which a heat-meltable laser light absorption layer having a relatively higher absorbance than the laser light transmission layer is integrally laminated. By cutting the laminated portion, a cut portion can be formed, and the wiring / pipe material can be inserted into the hollow cylinder through the cut portion. Then, with the wiring / piping material inserted into the hollow cylinder, the divided end faces that divide the laminated part in the width (circumferential) direction are brought into close contact with each other, and then the laser is applied to the split part from the outer surface of the hollow cylinder. By irradiating with light, the split end faces can be laser-welded to block off the cut portion with good appearance. That is, the manufacturing method of the present invention welds a part (the same material) of the hollow cylindrical body without separately preparing another material such as a coupling member, so that a high joint strength of the cut portion is ensured. In addition, it is advantageous in terms of workability and cost. Furthermore, in the manufacturing method of the present invention, the split end faces are directly joined without any other material, so that the cut portion can be closed as if there was no cut portion on the cylindrical wall of the hollow cylindrical body from the beginning. . That is, the manufacturing method of the present invention can prevent the bending property (flexibility) of the hollow cylinder from being impaired by the blockage of the cut portion.

  According to the manufacturing method of the hollow cylinder structure of Claim 3 of this invention, in addition to the invention of Claim 1 or 2, a hollow cylinder can be easily prepared through a formation process.

  According to the method for producing a hollow cylindrical structure according to claim 4 of the present invention, in addition to the invention according to any one of claims 1 to 3, the divided end faces are pressed in the close-contact direction at the time of laser light irradiation. As a result, the cut portion can be more firmly and reliably closed by laser welding.

  According to the method for manufacturing a hollow cylinder structure according to claim 5 of the present invention, in addition to the invention according to any one of claims 1 to 4, each divided end face is a plane orthogonal to the cylinder wall of the hollow cylinder. By being, it can be made to adhere | attach a parting end surface reliably.

  According to the method for manufacturing a hollow cylindrical structure according to claim 6 of the present invention, in addition to the invention according to any one of claims 1 to 5, the ridges and valleys of the corrugated tube are shifted in the axial direction when the laser beam is irradiated. When the divided end surfaces are brought into close contact with each other in a state where the end edges are in contact with each other, it is possible to prevent the end edges from overlapping and squeezing.

  According to the method for producing a hollow cylindrical structure according to claim 7 of the present invention, in addition to the invention according to any one of claims 1 to 6, the laser is applied to the inclination angle of the peaks and valleys in the axial direction of the corrugated tube The light irradiation angle is small. Thereby, it is possible to irradiate the laser beam to the outer surface of the trough more reliably without being disturbed by the crest of the corrugated tube.

  According to the method for producing a hollow cylindrical structure according to claim 8 of the present invention, in addition to the invention according to any one of claims 1 to 7, the irradiated laser light is transmitted through the laser light transmitting layer, and the laser is transmitted. Absorb to light absorption layer. By adopting carbon black in the laser light absorption layer, the laser light can be effectively absorbed into the laser light absorption layer.

  According to the hollow cylinder of claim 9 of the present invention, the hollow cylinder is located on the inner side of the laser beam transmitting layer, the heat-meltable laser beam transmitting layer constituting the outer layer, and the laser beam. A laminated portion in which a heat-meltable laser light absorption layer having a light absorbency relatively higher than that of the transmission layer is integrally laminated is provided. The laminated portion is formed continuously in the axial direction at a part of the circumferential direction of the hollow cylinder. That is, the installer can easily form a slit portion for inserting the wiring / pipe material into the interior by cutting the hollow cylindrical body along the laminated portion extending in the axial direction. The wiring / pipe material can be easily inserted into the hollow cylinder through the slit portion. Then, with the wiring / piping material inserted into the hollow cylinder, the divided end faces that divide the laminated part in the width (circumferential) direction are brought into close contact with each other, and then the laser is applied to the split part from the outer surface of the hollow cylinder. By irradiating with light, the split end faces can be laser-welded to block off the cut portion with good appearance. That is, by using the hollow cylinder of the present invention, it is possible to construct a hollow cylinder structure in which wiring and piping materials are arranged inside the hollow cylinder while suppressing the generation of burrs and the deterioration of appearance. Furthermore, in the hollow cylinder of the present invention, the split end faces are directly joined without any other material, so that the cutting part is blocked as if there was no cutting part on the cylindrical wall of the hollow cylinder from the beginning. obtain. That is, the hollow cylinder of the present invention can prevent the hollow cylinder from being damaged by the blockage of the cut portion.

  According to the hollow cylinder of claim 10 of the present invention, the hollow cylinder is located on the inner side of the heat-meltable laser light transmission layer constituting the outer layer and the laser light transmission layer, and is provided with laser light. A laminated portion in which a heat-meltable laser light absorption layer having a light absorbency relatively higher than that of the transmission layer is integrally laminated is provided. The wiring / pipe material can be easily inserted into the hollow cylindrical body through a cutting portion formed in advance so as to cut the laminated portion. Then, with the wiring / piping material inserted into the hollow cylinder, the divided end faces that divide the laminated part in the width (circumferential) direction are brought into close contact with each other, and then the laser is applied to the split part from the outer surface of the hollow cylinder. By irradiating with light, the split end faces can be laser-welded to block off the cut portion with good appearance. That is, by using the hollow cylinder of the present invention, it is possible to construct a hollow cylinder structure in which wiring and piping materials are arranged inside the hollow cylinder while suppressing the generation of burrs and the deterioration of appearance. Furthermore, in the hollow cylinder of the present invention, the split end faces are directly joined without any other material, so that the cutting part is blocked as if there was no cutting part on the cylindrical wall of the hollow cylinder from the beginning. obtain. That is, the hollow cylinder of the present invention can prevent the hollow cylinder from being damaged by the blockage of the cut portion.

  According to the hollow cylinder of claim 11 of the present invention, in addition to the invention of claim 10, each divided end face is a plane perpendicular to the cylindrical wall of the hollow cylinder, so that the divided end face can be reliably secured. It can be adhered.

  According to the hollow cylinder of the twelfth aspect of the present invention, in addition to the invention of any one of the ninth to eleventh aspects, the hollow cylinder has a corrugated tube in which peaks and valleys are continuous in the axial direction. can do.

  According to the hollow cylindrical body of the thirteenth aspect of the present invention, in addition to the invention of the twelfth aspect, the focal point of the laser beam is determined on the outer surface of the valley portion, and is necessary for fusing to the laser beam absorption layer at the peak portion. When the thermal energy is given, the thermal energy to the valley becomes relatively larger than the thermal energy to the mountain. In contrast, by relatively increasing the thickness of the laser light absorption layer in the valley, the risk of burning the cylindrical wall of the valley is reduced.

  According to the hollow cylinder of the fourteenth aspect of the present invention, in addition to the invention of the twelfth or thirteenth aspect, the height difference between the crest and trough in the laminated portion is relatively small. It is suppressed that the amount of heating by laser irradiation varies in the part and the valley part.

  According to the hollow cylinder of claim 15 of the present invention, in addition to the invention of any of claims 9 to 14, the hollow cylinder is made of polyethylene as a base material, so that the hollow cylinder can be easily and at low cost. A cylinder can be prepared.

  According to the hollow cylinder structure of the sixteenth aspect of the present invention, the hollow cylinder is located on the inner side of the laser beam transmitting layer, the heat-meltable laser beam transmitting layer constituting the outer layer, and the laser beam A laminated portion in which a heat-meltable laser light absorbing layer having a relatively higher absorbance than the light transmitting layer is integrally laminated is provided. The laminated portion is provided with a joint portion that divides the laminated portion in the width (circumferential) direction and continuously extends in the axial direction of the hollow cylindrical body. That is, the joining portion is a portion where the end faces of both pieces of the laminated portion that has been divided into two in the width direction are fused (without any other bonding material). And a junction part consists of two separate end faces in the cross section of a lamination | stacking part (laser) fusion trace, and this fusion trace is on the outer surface (both edges of a junction part) of a hollow cylinder. Does not reach. That is, the hollow cylinder structure of the present embodiment is such that generation of burrs and appearance are suppressed as much as possible, and a part (the same material) of the hollow cylinder is fused. Therefore, the high joining strength of the split part is ensured. Furthermore, in the hollow cylinder structure of the present invention, the split end faces are directly joined without any other material, so that the cutting part is not as if there was no cutting part from the beginning on the cylindrical wall of the hollow cylinder. It is blocked. That is, the hollow cylinder structure of the present invention prevents the hollow tube body from being deteriorated in flexibility (flexibility) due to the blockage of the cut portion, and the predetermined flexibility is maintained.

  According to the method for manufacturing a hollow cylindrical structure according to claim 17 of the present invention, the hollow cylindrical body is adjacent to the heat-meltable laser light transmission layer, the laser light transmission layer, and more than the laser light transmission layer. A laminated portion in which a heat-meltable laser light absorption layer having a relatively high absorbance is integrally laminated is provided. By cutting the laminated portion, a cut portion can be formed, and the wiring / pipe material can be inserted into the hollow cylinder through the cut portion. Then, with the wiring / pipe material inserted into the hollow cylinder, the split end faces that divide the laminated portion in the width (circumferential) direction are brought into close contact with each other, and the laser beam from the laser transmission layer side to the split portion. By irradiating, the split end faces can be laser-welded to block off the cut portion with good appearance. That is, the manufacturing method of the present invention welds a part (the same material) of the hollow cylindrical body without separately preparing another material such as a coupling member, so that a high joint strength of the cut portion is ensured. In addition, it is advantageous in terms of workability and cost. Furthermore, in the manufacturing method of the present invention, the split end faces are directly joined without any other material, so that the cut portion can be closed as if there was no cut portion on the cylindrical wall of the hollow cylindrical body from the beginning. . That is, the manufacturing method of the present invention can prevent the bendability (flexibility) of the hollow cylindrical body from being lowered due to the blockage of the cut portion.

The schematic perspective view of the hollow cylinder structure of one Embodiment of this invention. The (a) front view and (b) side view of the hollow cylinder used for the hollow cylinder structure of FIG. (A) AA sectional drawing and (b) the elements on larger scale of the hollow cylinder of FIG. (A) BB sectional drawing and (b) the elements on larger scale of the hollow cylinder of FIG. . It is one process of the method of manufacturing the hollow cylinder structure of one Embodiment of this invention, Comprising: (a) The process of inserting wiring and piping material through a slit part inside a hollow cylinder, (b) Wiring and piping The schematic diagram which shows the process of closely welding the division | segmentation end surface of a cutting part in the state which has arrange | positioned the material inside a hollow cylinder, and the process of laser-welding a division part in the state which contact | connected the division | segmentation end surface of the division part. The schematic diagram explaining the laser welding process of FIG. 7 in detail. The (a) cross-sectional view and (b) partial enlarged view of the hollow cylinder structure of FIG. The partial expanded sectional view of the hollow cylinder of the modification of this invention. The schematic diagram explaining the manufacturing method of the hollow cylinder structure of the modification of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the shape of each figure referred in the following description is a conceptual diagram or a schematic diagram for explaining a suitable shape dimension, and a dimension ratio etc. do not necessarily correspond with an actual dimension ratio. That is, the present invention is not limited to the dimensional ratio in the drawings.

  A hollow cylinder structure 10 according to an embodiment of the present invention has a wiring / pipe material 11 disposed inside a flexible hollow cylinder 100 that functions as a protective tube. In other words, the hollow cylinder structure 10 includes a wiring / piping material 11 and a hollow cylinder 100 in which the wiring / piping material 11 is disposed. FIG. 1 is a schematic perspective view of the hollow cylinder structure 10. As shown in FIG. 1, the hollow cylinder 100 is closed in the entire circumferential direction by a joint portion 108 in the stacked portion 102. The wiring / pipe material 11 is housed and protected inside the hollow cylinder 100 without being exposed to the outside in the radial direction of the hollow cylinder 100. In the hollow cylinder structure 10 of the present embodiment, the wiring / pipe material 11 is a general cable, and the hollow cylinder 100 is a corrugated pipe. However, the configuration and use of the present invention are not limited to this embodiment. For example, the wiring / pipe material may be a conduit or a wire, and the hollow cylinder may be a straight tube or a cylindrical covering material. Furthermore, the hollow cylinder structure 10 may be a covered electric wire, a wire harness, or the like. That is, the technical idea of the present invention can be applied to various uses.

  With reference to FIG. 2 thru | or FIG. 4, the structure of the hollow cylinder 100 used for the hollow cylinder structure 10 of this embodiment is demonstrated. 2A and 2B are a front view and a side view of the hollow cylinder 100. FIG. 3A and 3B are a longitudinal (AA) cross-sectional view and a partially enlarged view of the hollow cylinder 100. FIG. 4A and 4B are a horizontal (BB) cross-sectional view and a partially enlarged view of the hollow cylinder 100. FIG.

  The hollow cylinder 100 is a flexible corrugated tube in which a crest 100a and a trough 100b are continuous in the axial direction. The cylindrical wall of the hollow cylindrical body 100 includes a peripheral wall portion 101 that occupies most of the circumferential direction and a laminated portion 102 that occupies the remaining portion. The laminated portion 102 is continuously formed in the axial direction at a part of the circumferential direction of the hollow cylinder 100. The laminated portion 102 linearly extends in a strip shape with a predetermined width, and the cut portion 105 can be formed on the laminated portion 102. The width of the stacked portion 102 is preferably narrow so as to function as a guide (mark) for cutting the cut portion 105 linearly, but may be arbitrarily determined.

  Moreover, in the laminated part 102, the height difference of the peak part 100a and the trough part 100b is small compared with locations other than the laminated part 102 (peripheral wall part 101). In the present embodiment, the height difference h1 in the laminated portion 102 is about 1.5 mm, and the height difference h2 in the peripheral wall portion 101 is 2.5 mm. As described above, the difference in height between the stacked portions 102 is relatively reduced, so that the intensity of the laser irradiated to the stacked portions 102 is suppressed from becoming uneven between the peak portions 100a and the valley portions 100b.

  As shown in FIGS. 3 and 4, the peripheral wall portion 101 is made of a single (single layer) resin material and constitutes most of the peripheral wall of the hollow cylinder 100. In this embodiment, since the surrounding wall part 101 does not become an object of cutting and laser welding, the material can be selected arbitrarily. On the other hand, the laminated portion 102 is composed of a thermoplastic resin (thermomeltable) laser light transmitting layer 103 constituting the outer layer of the hollow cylinder 100 and a thermoplastic resin (thermophilic material) located on the inner layer side of the laser light transmitting layer 103. And a laser beam absorbing layer 104 having a melting property. That is, the laminated portion 102 is obtained by integrally laminating the laser light transmission layer 103 and the laser light absorption layer 104.

  The laser light transmission layer 103 is configured to transmit at least a part of the irradiated laser light. That is, the thickness and material of the laser light transmission layer 103 are selected so as to have thermoplasticity and a transmittance of preferably 15% or more, more preferably 30% or more. In this embodiment, the thickness of the laser light transmission layer 103 is about 0.5 mm, and the material thereof is polyethylene (PE) which is a polyolefin resin. However, the present invention is not limited to this embodiment. For example, polyamide (PA), polypropylene (PP), polycarbonate (PC), polyoxymethylene (POM), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate can be used as the thermoplastic resin constituting the laser light transmission layer 103. (PBT), polyphenylene sulfide (PPS), acrylic (PMME), or the like may be used. In addition, about the resin coating material of the laser light transmission layer 103, dyes that easily transmit laser light are generally used, and the addition of pigments that greatly reduce the laser light transmittance is partially restricted.

  More preferably, the laser light transmission layer 103 may transmit laser light and absorb part of the laser light. For example, the laser light transmission layer 103 is formed by adding a trace amount of carbon black (for example, about 0.01% by weight or less) or a weak laser light absorber to polyethylene as a base material. The weak laser light absorber may be selected from nigrosine, aniline black, phthalocyanine, naphthalocyanine, porphyrin, perylene, quaterylene, azo dye, anthraquinone, squaric acid derivative, immonium dye and the like. That is, when the laser light transmission layer 103 is irradiated with laser light, the laser light weak absorbent in the laser light transmission layer 103 absorbs part of the laser light and generates heat weakly, and the laser light absorption layer 104 is thermally melted. Assisted. In addition, it is preferable to adjust the addition amount of carbon black or a laser beam weak absorber so that the transmittance of the laser beam absorption layer 104 is maintained at about 15% or more.

  The laser light absorption layer 104 is defined as a layer having a relatively low transmittance (or relatively high light absorption rate) than the laser light transmission layer 103. The laser light absorbing layer 104 is not particularly limited as long as it has thermoplasticity and can absorb laser light. In the present embodiment, the thickness of the laser light absorption layer 104 is about 0.5 mm to 1.0 mm (changes depending on the position). In addition, in the axial direction of the hollow cylinder 100, the wall part between the peak part 100a and the trough part 100b becomes relatively thin for convenience of molding, and the part where the resin pool becomes relatively thick (drawing) Not detailed). The material of the laser light absorbing layer 104 is obtained by adding a predetermined amount of carbon black as an additive to polyethylene (PE) as a base material (about 2 wt% in this embodiment, but the amount of addition is not limited). is there. That is, mixing a proper amount of carbon black increases the light absorption of the resin material, and as a result, the amount of heat generated by laser irradiation increases. The transmittance of the laser light absorption layer 104 is preferably 10% or less. And the addition amount of carbon black can be adjusted so that it may match the transmittance | permeability of the target laser-light absorption layer 104. FIG. The material of the laser light absorption layer of the present invention is not limited to this embodiment. For example, as a base material of a thermoplastic resin constituting the laser light absorption layer 104, polyamide (PA), polypropylene (PP), Polycarbonate (PC), polyoxymethylene (POM), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), acrylic (PMME), and the like may be used. And if it can generate | occur | produce a heat | fever by absorbing a laser beam, it changes into carbon black and other pigment-type absorption dyes other than black may be added to a base material.

  In the present embodiment, as shown in FIG. 4B, the peripheral wall portion 101 and the laser light absorption layer 104 of the laminated portion 102 are integrally formed of the same material. The laser light transmitting layer 103 is integrally coupled to the circumferential end of the peripheral wall 101 and the outer surface of the laser light absorbing layer 104. In addition, as shown in FIG. 3B, the thickness of the laser light transmission layer 103 is substantially uniform in the peak portion 100a and the valley portion 100b, whereas the thickness of the laser light absorption layer 104 is a continuous peak portion. It differs in 100a and trough part 100b. That is, the thickness t1 (about 0.8 mm) of the laser light absorption layer 104 in the peak portion 100a is thinner than the thickness t2 (about 1.0 mm) of the laser light absorption layer 104 in the valley portion 100b. Further, the inclination angle α (see FIG. 3B) of the wall portion between the crest portion 100a and the trough portion 100b in the axial direction of the hollow cylinder 100 is larger than the irradiation angle θ of the laser light L (see FIG. 6). . In the manufacturing method of the present embodiment, the inclination angle α is 6 °, and the irradiation angle θ of the laser light L is set to 5 °.

  The hollow cylinder 100 of the present embodiment is formed as a corrugated tube by corrugated molding, and the laser light transmitting layer 103 of the laminated portion 102 is integrated with the peripheral wall portion 101 and the laser light absorbing layer 104 by two-color molding. It can be manufactured by molding. However, the hollow cylinder of the present invention can be manufactured by other general manufacturing methods.

  Next, with reference to FIG. 5, a method for manufacturing the hollow cylinder structure 10 by arranging the wiring / pipe material 11 inside the hollow cylinder 100 will be described.

  First, the hollow cylinder 100 is prepared together with the wiring / pipe material 11. By continuously cutting the hollow cylinder 100 along the axial direction so as to divide the laminated portion 102 of the hollow cylinder 100 in the width direction, a slit portion 105 that can be opened on the cylinder wall of the hollow cylinder 100 is provided. Form. The slit portion 105 may be formed over the entire axial direction of the hollow cylinder 100, or may be partially formed in the axial direction of the hollow cylinder 100 if the wiring / pipe material 11 can be introduced. Good. In the present embodiment, since the laminated portion 102 having a relatively narrow width extends linearly along the axial direction, the builder uses the cutter or the like along the center in the width direction of the laminated portion 102 to remove the hollow cylinder 100. The cutting part 105 can be easily formed by cutting. Note that the cut portion 105 may be formed in advance on the laminated portion 102 of the hollow cylinder 100. In this case, the process of cutting the hollow cylinder 100 by the installer is omitted. As a result, a split end face 106 is formed on the outer edge portion of the cut portion 105 through the cut portion 105. The dividing end face 106 is preferably a plane that is orthogonal to the cylinder wall of the hollow cylinder 100. If it carries out like this, it will become possible to contact | connect the opposing parting end surfaces 106 more reliably.

  Next, as shown in FIG. 5 (a), the peripheral wall portion 101 of the hollow cylinder 100 is bent and deformed to open the cut portion 105, and the wiring / pipe material 11 enters the hollow cylinder 100 from the cut portion 105. To accommodate. The open width of the cut portion 105 is preferably about 1.5 times or more the diameter of the wiring / piping material 11 in terms of work convenience. Then, the wiring / piping material 11 may be accommodated in the slit portion 105 so as to be translated from the radial direction thereof, or the end of the wiring / piping material 11 may be inserted into the slit portion 105 to be pivoted. You may accommodate in an inside so that it may move to a direction.

  Next, as shown in FIG. 5 (b), with the wiring / pipe material 11 arranged inside the hollow cylinder 100, the slit portion 105 is formed while returning the elastically deformed peripheral wall portion 101 to its original shape (elastic). The opposing cut end faces 106 are brought into close contact with each other. At this time, it is preferable to press the divided end faces in the close contact direction. Furthermore, it is preferable that the divided end faces 106 are brought into close contact with each other in a state where the peaks and valleys of the hollow cylinder 100 are slightly shifted in the axial direction in order to prevent the end edges from being slid when the pressure is applied.

  And as shown in FIG.5 (c), laser beam irradiation is carried out from the outer surface of the hollow cylinder 100 with respect to the slit part 105 (interface between the parting end surfaces 106) in the state by which the parting end surfaces 106 were closely_contact | adhered and pressurized. A laser beam L is locally irradiated by an apparatus (not shown). The laser light L can be arbitrarily selected from a fiber laser (wavelength: 1070 nm), a YAG (yttrium, aluminum, garnet crystal) laser, a laser diode (wavelength: 808, 840, 940 nm), and the like. Then, due to laser irradiation for a predetermined time, both the divided end faces 106 and 106 at the irradiated position are thermally melted. The laser irradiation time required for melting can be appropriately selected according to the intensity of the laser beam L and the like. The laser beam L is relatively moved from one end to the other end of the split portion 105 along the axial direction of the hollow cylinder 100 while the divided end face 106 is melted by heat. The laser beam L may be moved with respect to the hollow cylinder 100 or the hollow cylinder 100 may be moved with respect to the laser beam L.

  More specifically, as shown in FIG. 6, when the laser beam L is locally applied to the contact portion of the divided end face 106, the laser beam L passes (transmits) through the laser beam transmitting layer 104 on the outer layer side, The amount of laser light L corresponding to the transmittance of the laser light transmission layer 103 is absorbed by the surface of the laser light absorption layer 104 on the inner layer side. At this time, since the laminated portion 102 is composed of at least two layers of the laser light transmission layer 103 and the laser light absorption layer 104, the laser light absorption layer 104 transmits the laser light L through the cylindrical wall to the inside. It is possible to prevent the outer surface of the disposed wiring / piping material 11 from being melted. Then, the laser light absorption layer 104 is preferentially heated at the cut portion 105 (interface between the divided end faces 106). Subsequently, heat is transferred from the heating surface of the laser light absorption layer 104 (interface between the laser light transmission layer 103 and the laser light absorption layer 104) in the thickness direction along the interface between the divided end faces 106 (that is, the laser light transmission layer). 103 both on the outer surface side of 103 and on the inner surface side of the laser light absorption layer 104), and the entire cut end face 106 is heated and melted. In particular, the laminated portion 102 is composed of two layers, a laser light transmission layer 103 and a laser light absorption layer 104, and the laser light transmission layer 103 covers the laser light absorption layer 104, so that the melting direction of the laser light absorption layer 103 is divided. It is determined on the end face 106 side and can be efficiently welded. For example, when the irradiated portion (bonded portion) of the laser light L is a single layer, the resin is melted in the free direction, so the heat transfer efficiency is not good. On the other hand, in this embodiment, as shown in FIG. 6, the surface of the laser light absorption layer 104 (or the interface between the two layers) at the divided end face 106 is locally heated by the laser light L, so that the heat is Rather than the circumferential direction of the hollow cylinder 100, it can be transmitted preferentially to the divided end face 106 side.

  As a result, the heat-melted divided end faces 106 form a molten pool 107 and are mixed together in materials. When a weak laser beam absorber is added to the laser beam transmission layer 103, the laser beam transmission layer 103 itself generates heat (weaker than the laser beam absorption layer 104) and the laser beam transmission layer 103 is thermally melted. Assisted. That is, the inside (cross section) of the hollow cylinder 100 is greatly melted compared to its outer surface. After the laser beam L moves from the irradiated position, the molten pool 107 is solidified by natural cooling or a cooling process, and the divided end faces 106 are joined (fused) together. Subsequently, the laser light L advances alternately on the outer surface of the peak portion 100a and the valley portion 100b along the axial direction. In this way, it is possible to block the entire slit portion 105 by laser welding the cut end faces 106 in order along the axial direction.

In addition, the method of arrange | positioning the wiring and piping material 11 demonstrated above in the inside of the hollow cylinder 100 can be implemented with the following cable accommodation apparatuses as a series of processes.
Cable housing device
Conveyor means for feeding the hollow cylinder in the axial direction;
Cutting means for forming a slit in the hollow cylinder;
Opening means for opening the slit part;
A cable insertion means for inserting (or pushing) the cable into the opened slit,
A pressing means for closely contacting and pressing the split end faces facing each other via the slitting portion;
A laser irradiation device for irradiating the cutting part with laser light;
Winding means for winding up the hollow cylindrical structure constructed by closing the cut portion.
Each said means can be prepared as mechanically known means, such as a robot arm and a cutter, for example.

  FIG. 7 is a cross-sectional view of the hollow cylindrical structure 10 manufactured by the above manufacturing method. As shown in FIG. 7, by laser welding, the laminated portion 102 is divided in the width direction to form a joint portion 108 that continuously extends in the axial direction of the hollow cylinder 100. The joining portion 108 forms a laser fusion mark (or fusion mark, fusion cross-section) 108 a in which the cut end faces 106 are melted and fused in the cross section along the axial direction of the hollow cylinder 100. . In other words, the laser fusion mark 108a shows a state in which the divided end faces 106 made of the same material are fused, fused and solidified to be integrally joined. Therefore, the bonding portion 108 has a sufficient bonding strength compared to bonding between different materials. Further, the laser fusion mark 108a of the joining portion 108 does not appear on the outer surface of the hollow cylindrical body 100 and is formed substantially only in the cross section of the laminated portion 102, so that the appearance of the hollow cylindrical structure 10 is deteriorated. There is nothing. Further, the shape of the hollow cylinder 100 (after the laser treatment) in the hollow cylinder structure 10 is not substantially different from the original shape of the hollow cylinder 100 before the laser treatment. Therefore, the spine that lowers the bendability as in the conventional case is not formed at the joint portion 108, and the bendability (flexibility) is almost the same as that of the original hollow cylinder 100.

  Hereinafter, the operation and effect of the embodiment according to the present invention will be described.

  According to the present embodiment, the hollow cylinder 100 is located on the inner side of the laser beam transmissive layer 103 and the heat-meltable laser beam transmissive layer 103 constituting the outer layer thereof. The laminated portion 102 is integrally laminated with a heat-meltable laser light absorbing layer 104 having a particularly high absorbance. The wiring / pipe material 11 can be inserted into the hollow cylindrical body 100 through the cut portion 105 formed so as to cut the laminated portion 102. Then, with the wiring / pipe material 11 inserted in the hollow cylinder 100, the divided end faces 106 that divide the laminated portion 102 in the width (circumferential) direction are brought into close contact with each other, and then the hollow cylinder is formed with respect to the cut portion 105. By irradiating the laser beam L from the outer surface of the body 100, the split end surfaces 106 can be laser-welded to block the cut portion 105 with certainty and good appearance. That is, in the laser welding process of the cut portion 105, heat is sequentially conducted from the surface of the laser light absorption layer 104 at the center in the thickness direction of the hollow cylinder 100 to the inside and outside in the thickness direction, and the divided end face 106 is preferentially melted and solidified. As a result, almost no traces of melting appear on the outer surface of the hollow cylinder. Therefore, in the hollow cylinder structure 10 of this embodiment, it can suppress as much as possible that a burr | flash generate | occur | produces on the outer surface of the hollow cylinder 100, or a fusion mark remains on the outer surface and the appearance of the hollow cylinder structure 10 deteriorates. Furthermore, in this embodiment, since the split end faces 106 are directly joined without any other material, the cut portion 105 is blocked as if the cut portion 105 had not been provided on the tube wall of the hollow cylinder 100 from the beginning. Can be done. In other words, this embodiment can prevent the hollow cylinder 100 from being damaged (flexible) by closing the cut portion 105 and maintain a predetermined flexibility. And since the manufacturing method of this embodiment welds a part (same material) of the hollow cylinder 100, without preparing another material like a coupling member separately, the high joint strength of the cut part 105 is ensured. However, it is also advantageous in terms of workability and cost.

  In the present embodiment, the irradiation angle θ of the laser light L is smaller than the inclination angle α of the wall portion between the peak portion 100a and the valley portion 100b in the axial direction of the hollow cylinder 100. Thereby, it is possible to irradiate the laser beam L to the outer surface of the trough part 100b more reliably without being disturbed by the crest part 100a of the hollow tube 100 corrugated tube. In the present embodiment, the focal point of the laser beam L is determined on the valley 100b side of the hollow cylinder 100, but the height difference between the peak 100a and the valley 100b in the stacked portion 102 is relatively small. . For this reason, it is suppressed that the amount of heating by laser irradiation varies in the peak portion 100a and the valley portion 100b. Furthermore, the thickness of the laser light absorption layer 104 in the peak portion 100a is thinner than the thickness of the laser light absorption layer 104 in the valley portion 100b. When the focal point of the laser beam is determined on the outer surface of the valley portion 100b, the thermal energy to the valley portion 100b is relatively larger than the thermal energy to the mountain portion 100a. Therefore, when heat energy necessary for fusion is applied to the laser light absorption layer 104 of the peak portion 100a, excessive heat energy is applied to the laser light absorption layer 104 of the valley portion 100b, and the cylindrical wall of the valley portion 100b is There was a risk of burning out. In other words, by relatively increasing the thickness of the laser light absorption layer 104 in the valley portion 100b, the possibility that the cylindrical wall of the valley portion 100b is burned out is reduced.

[Modification]
The present invention is not limited to the above embodiment, and various modifications can be made. Hereinafter, modifications of the present invention will be described. Note that, in each modified example, components having the same last two digits in the components indicated by three digits have the same or similar features unless otherwise described, and a part of the description is omitted.

(1) The hollow cylinder of the present invention is not limited to the above embodiment. For example, in the above embodiment, the hollow cylinder is a corrugated tube, but may be a smooth tube. In that case, the smooth tube can be manufactured by extrusion molding, and the laminated portion can be formed by two-color molding. When the smooth tube is employed, the flexibility of the tube itself is inferior, but the laser beam can be irradiated more uniformly along the axial direction.

(2) The hollow cylinder of the present invention is not limited to the above embodiment. The laminated portion of the hollow cylindrical body may have a configuration of three or more layers as long as it includes at least a laser light transmission layer and a laser light absorption layer. For example, the additional layer 209 may be laminated | stacked on the inner surface of the surrounding wall part 201 and the laminated part 202 like the hollow cylinder 200 of Fig.8 (a). Alternatively, as in the hollow cylindrical body 300 of FIG. 8B, the laser light transmission layer 303 of the stacked portion 302 is changed to the first transmission layer 303a and the second transmission (which differs in composition and absorbance from the first transmission layer 303a). Two layers of the layer 303b may be used. Moreover, in the said embodiment, although the laminated part is formed as one narrow strip | belt body extended over the whole axial direction of a hollow cylinder, this invention is not limited to this. For example, the laminated portion may be formed on a part of the hollow cylinder in the axial direction. The laminated part may occupy most of the circumferential direction of the hollow cylinder. Alternatively, the stacked portion may form a plurality of stacked portions in the circumferential direction. Therefore, the hollow cylinder can take various forms under the technical idea of the present invention.

(3) In the manufacturing method of the present invention, the laminated portion of the hollow cylinder is formed in a part of the circumferential direction, but the present invention is not limited to the above embodiment. That is, as in the hollow cylinder 400 of FIG. 9, the entire circumferential direction of the cylindrical wall of the hollow cylinder 400 may be the stacked portion 402. In this modification, the wiring / pipe material 11 is inserted through the cutting portion 405, the cut end surface 406 is brought into close contact, and the cutting portion 405 is irradiated with the laser light L, so that the cutting portion is formed as in the above embodiment. 405 can be laser-welded and closed with good appearance.

(4) In the manufacturing method of this invention, a laminated part has a laser beam transmission layer in the outer surface side of a hollow cylinder, and has a laser beam absorption layer in an inner surface side. However, the present invention is not limited to this. That is, the laser light absorption layer may be disposed on the outer surface side of the cylinder wall, and the laser light transmission layer may be disposed on the inner surface side of the cylinder wall. In this case, the laser beam irradiation device is disposed inside the hollow cylinder, and the laser is irradiated to the slit from the inner surface side of the hollow cylinder, so that the laser is welded to the slit as in the above embodiment. And it can be closed up nicely. Furthermore, in this modification, when laser irradiation is performed from the inside of the hollow cylindrical body, the possibility that the wiring / pipe material disposed inside the hollow cylindrical body is melted or damaged by the laser light can be eliminated.

(5) In the manufacturing method of the said embodiment, one slit part was formed along the axial direction on the outer surface of the hollow cylinder. However, the present invention is not limited to the above method. For example, with respect to a hollow cylindrical body having two laminated portions, the hollow cylindrical body is divided into two divided pieces by forming two slit portions in each laminated portion, and divided so as to surround the wiring / pipe material. Two pieces may be closed by laser welding together with the pieces. For example, such a method can be selected when the ratio of the outer diameter of the wiring / pipe material to the inner diameter of the hollow cylinder is large.

  The present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes as long as they belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Hollow cylinder structure 11 Wiring and piping material 100 Hollow cylinder 100a Mountain part 100b Valley part 101 Peripheral wall part 102 Laminated part 103 Laser light transmission layer 104 Laser light absorption layer 105 Split part 106 Split end face 107 Molten pool 108 Joint part 108a Laser Fusing marks (or fusing marks)
L Laser light

Claims (17)

A method of manufacturing a hollow cylinder structure in which wiring and piping materials are disposed inside the hollow cylinder,
A step of preparing a hollow cylinder, wherein the hollow cylinder is located on the inner side of the laser beam transmission layer, a heat-meltable laser beam transmission layer constituting an outer layer of the hollow cylinder, and the laser A laminated portion integrally laminated with a heat-meltable laser light absorption layer having a relatively lower transmittance than the light-transmitting layer, and the laminated portion is at least a part in the circumferential direction of the hollow cylindrical body The laminated portion is formed with an openable slit portion that divides the laminated portion in the width direction and continuously extends in the axial direction of the hollow cylindrical body. , Process and
A step of accommodating the wiring / piping material from the slit portion;
After closely contacting the split end faces through the split section, the split section is irradiated with laser light from the outer surface of the hollow cylindrical body, and the split end faces are laser welded to form the split section. A blockage step;
The manufacturing method characterized by including. A method of manufacturing a hollow cylinder structure in which wiring and piping materials are disposed inside the hollow cylinder,
A heat-meltable laser light transmission layer constituting the outer layer of the hollow cylinder, and a heat-meltable laser light transmission layer located on the inner layer side of the laser light transmission layer and having a relatively lower transmittance than the laser light transmission layer A step of preparing the hollow cylindrical body in which a laminating portion in which a laser light absorption layer is integrally laminated is continuously formed in an axial direction in at least a part of the circumferential direction of the hollow cylindrical body;
Forming a slit part that can be opened in the hollow cylinder by continuously cutting the hollow cylinder along the axial direction so as to divide the laminated part in the width direction;
A step of accommodating the wiring / piping material from the slit portion;
After contacting the cut end faces facing each other via the cut portion, the cut portion is irradiated with laser light from the outer surface of the hollow cylinder, and the cut end surface is laser welded to close the cut portion. And a process of
The manufacturing method characterized by including.   The manufacturing method according to claim 1, wherein the step of preparing the hollow cylinder includes a step of forming the hollow cylinder.   4. The manufacturing method according to claim 1, wherein the step of closing the cut portion includes a step of pressurizing the divided end faces in a close-contact direction at the time of laser light irradiation.   5. The manufacturing method according to claim 1, wherein each of the divided end surfaces is a plane orthogonal to a cylindrical wall of the hollow cylindrical body. The hollow cylinder is a corrugated tube in which a crest and a trough are continuous in the axial direction,
6. The step of closing the slit portion includes a step of bringing the divided end faces into close contact with each other in a state in which the peaks and valleys of the corrugated tube are shifted in the axial direction when the laser beam is irradiated. The manufacturing method according to claim 1. The hollow cylinder is a corrugated tube in which a crest and a trough are continuous in the axial direction,
7. The laser light irradiation angle is smaller than the angle of inclination of the corrugated tube in the axial direction in the step of closing the slit portion. 8. Manufacturing method. The laser light transmission layer is made of a polyolefin-based thermoplastic resin,
2. The laser light absorbing layer is composed of a base material made of a polyolefin-based thermoplastic resin and carbon black which is added to the base material and absorbs laser light to generate heat. The manufacturing method as described in any one of 7 to 7. A hollow cylinder for arranging wiring and piping materials inside,
A heat-meltable laser light transmission layer constituting the outer layer of the hollow cylinder, and a heat-meltable laser light transmission layer located on the inner layer side of the laser light transmission layer and having a relatively lower transmittance than the laser light transmission layer Provided with a laminated part in which the laser light absorption layer is laminated integrally,
The said laminated part is continuously formed in the axial direction in a part of circumferential direction of the said hollow cylinder, The hollow cylinder characterized by the above-mentioned. A hollow cylinder for arranging wiring and piping materials inside,
A heat-meltable laser light transmission layer constituting the outer layer of the hollow cylinder, and a heat-meltable laser light transmission layer located on the inner layer side of the laser light transmission layer and having a relatively lower transmittance than the laser light transmission layer Provided with a laminated part in which the laser light absorption layer is laminated integrally,
The laminated portion is formed continuously in the axial direction at a part of the circumferential direction of the hollow cylindrical body, and the laminated portion is divided in the width direction so as to be axial in the hollow cylindrical body. A hollow cylindrical body characterized in that a slit portion extending continuously is formed.   The hollow cylinder according to claim 10, wherein the divided end faces opposed to each other through the slit portion are planes orthogonal to the cylinder wall of the hollow cylinder.   The hollow cylinder according to any one of claims 9 to 11, wherein the hollow cylinder is a corrugated tube in which a peak portion and a valley portion are continuous in an axial direction.   The hollow cylinder according to claim 12, wherein a thickness of the laser light absorption layer in the peak portion of the corrugated tube is thinner than a thickness of the laser light absorption layer in the valley portion.   The hollow cylinder according to claim 12 or 13, wherein in the laminated portion, a difference in height between the crest and the trough is small as compared with a portion other than the laminated portion.   The hollow cylinder according to any one of claims 9 to 14, wherein a base material of the hollow cylinder is polyethylene. A hollow cylinder structure comprising a wiring / piping material and a hollow cylinder having the wiring / piping material disposed therein,
The hollow cylinder is located on the inner side of the laser beam transmitting layer and a heat-meltable laser beam transmitting layer constituting the outer layer of the hollow cylinder, and has a relatively lower transmittance than the laser beam transmitting layer. And a laminated part integrally laminated with a heat-meltable laser light absorption layer having
The laminated portion is formed continuously in the axial direction at a part of the circumferential direction of the hollow cylindrical body, and the laminated portion is divided in the width direction so as to be axial in the hollow cylindrical body. The hollow cylinder structure is characterized in that a joint part extending continuously is formed, and a fusion mark of the joint part is formed on a cross section of the laminated part without appearing on the outer surface of the hollow cylinder. A method of manufacturing a hollow cylinder structure in which wiring and piping materials are disposed inside the hollow cylinder,
A step of preparing a hollow cylinder, wherein the hollow cylinder is adjacent to the heat-meltable laser light transmission layer and the laser light transmission layer, and has a relatively lower transmittance than the laser light transmission layer. A laminated portion integrally laminated with a heat-meltable laser light absorption layer having, the laminated portion is formed continuously in the axial direction in at least a part of the circumferential direction of the hollow cylinder, The laminated portion is formed with an openable slit portion that divides the laminated portion in the width direction and continuously extends in the axial direction of the hollow cylinder, and
A step of accommodating the wiring / piping material from the slit portion;
After closely attaching the cut end faces facing each other through the cut portion, the laser light is irradiated from the laser light transmitting layer side to the cut portion, and the cut end portions are laser welded to form the cut portion. A blockage step;
The manufacturing method characterized by including.

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